Optical polarization-state converting apparatus for use as isolator, modulator and the like
US5245465A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 4, 1992 |
| Grant date | Sep 14, 1993 |
| Priority date | — |
| Expiry date | Sep 4, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/0955
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In a polarization-state converting apparatus for use as an optical isolator, an optical modulator and the like, there are provided a waveguide including a magnetic semiconductor, a device for applying a magnetic field to the waveguide in a first predetermined direction, a device for applying an electric field to the waveguide in a second predetermined direction, and a mode conversion is caused via electrooptic and magnetooptic effects due to the electric and magnetic fields to change the polarization state of light propagating through the waveguide. When used as an optical isolator, the optical isolation is performed to compensate for degradation of the mode conversion rate due to a phase mismatch between light incident upon the waveguide and light emerging from the waveguide. When used as an optical modulator, the optical modulation of light emerging from the waveguide is performed by varying the electric field and an optical isolation function is effected while compensating for degradation of the mode conversion rate due to a phase mismatch between light incident upon the waveguide and light emerging from the waveguide.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.